[Mac][MC] Implement notification updates and relayouts.

ui/message_center/cocoa/notification_controller_unittest.mm

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ui/message_center/cocoa/notification_controller.h"
 
 #include "base/memory/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/utf_string_conversions.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 121 matching lines @@
       [[MCNotificationController alloc] initWithNotification:notification.get()
                                                messageCenter:&messageCenter]);
   [controller view];
 
   [[controller closeButton] performClick:nil];
 
   EXPECT_EQ(1, messageCenter.remove_count());
   EXPECT_EQ("an_id", messageCenter.last_removed_id());
   EXPECT_TRUE(messageCenter.last_removed_by_user());
 }
+
+TEST_F(NotificationControllerTest, Update) {
+  scoped_ptr<message_center::Notification> notification(
+      new message_center::Notification(
+          message_center::NOTIFICATION_TYPE_SIMPLE,
+          "",
+          ASCIIToUTF16("A simple title"),
+          ASCIIToUTF16("This message isn't too long and should fit in the"
+                       "default bounds."),
+          string16(),
+          std::string(),
+          NULL));
+  scoped_nsobject<MCNotificationController> controller(
+      [[MCNotificationController alloc] initWithNotification:notification.get()
+                                               messageCenter:NULL]);
+
+  // Set up the default layout.
+  [controller view];
+  EXPECT_EQ(NSHeight([[controller view] frame]),
+            message_center::kNotificationIconSize);
+  EXPECT_FALSE([[controller iconView] image]);
+
+  // Update the icon.
+  notification->set_icon(gfx::Image([TestIcon() retain]));
+  [controller updateNotification:notification.get()];
+  EXPECT_EQ(TestIcon(), [[controller iconView] image]);
+  EXPECT_EQ(NSHeight([[controller view] frame]),
+            message_center::kNotificationIconSize);
+}